package com.csmy.my.center.util.servlet;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Random;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONObject;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.log4j.Logger;
import org.apache.struts2.ServletActionContext;

import com.csmy.my.center.action.UploadFileAction;
import com.csmy.my.center.util.StringUtil;

public class UploadFileServlet extends HttpServlet {

	private static final long serialVersionUID = 3562656927366899750L;
	private Logger log = Logger.getLogger(UploadFileAction.class);
	@SuppressWarnings("unchecked")
	@Override
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
           
        StringUtil.xprint("开始上传文件....");
        
		response.setContentType("text/html; charset=UTF-8");
		// 文件保存目录路径
		String savePath = ServletActionContext.getServletContext().getRealPath("/") + "kindeditor/attached/";
		// 文件保存目录URL
		String saveUrl = request.getContextPath() + "/kindeditor/attached/";
		// 定义允许上传的文件扩展名
		String[] fileTypes = new String[] { "gif", "jpg", "jpeg", "png", "bmp" };
		//定义允许上传的文件扩展名
		HashMap<String, String> extMap = new HashMap<String, String>();
		extMap.put("image", "gif,jpg,jpeg,png,bmp");
		extMap.put("flash", "swf,flv");
		extMap.put("media", "swf,flv,mp3,mp4,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb");
		extMap.put("file", "doc,docx,xls,xlsx,ppt,htm,html,txt,zip,rar,gz,bz2");
		// 最大文件大小
		long maxSize = 30 * 1024 * 1024;

		PrintWriter out = null;
		try {
			out = response.getWriter();
		} catch (IOException e1) {
			log.error(e1);
		}

		if (!ServletFileUpload.isMultipartContent(request)) {
			out.println(getError("请选择文件。"));
			return;
		}

		// 检查目录
		File uploadDir = new File(savePath);
		if (!uploadDir.isDirectory()) {
			out.println(getError("上传目录不存在。"));
			return;
		}
		// 检查目录写权限
		if (!uploadDir.canWrite()) {
			out.println(getError("上传目录没有写权限。"));
			return;
		}
		
		String dirName = request.getParameter("dir");
		if (dirName == null) {
			dirName = "image";
		}
		
		//创建文件夹
		savePath += dirName + "/";
		saveUrl += dirName + "/";
		File saveDirFile = new File(savePath);
		if (!saveDirFile.exists()) {
			saveDirFile.mkdirs();
		}
		
		// 创建文件夹
		SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
		String ymd = sdf.format(new Date());
		savePath += ymd + "/";
		saveUrl += ymd + "/";
		File dirFile = new File(savePath);
		if (!dirFile.exists()) {
			dirFile.mkdirs();
		}
		
		try {
			FileItemFactory factory = new DiskFileItemFactory();
			ServletFileUpload upload = new ServletFileUpload(factory);
			upload.setHeaderEncoding("UTF-8");
			List items = upload.parseRequest(request);
			Iterator itr = items.iterator();
			while (itr.hasNext()) {
				FileItem item = (FileItem) itr.next();
				String fileName = item.getName();
			    System.out.println("fileName===="+fileName);
				long fileSize = item.getSize();
				if (!item.isFormField()) {
					//检查文件大小
					if(item.getSize() > maxSize){
						out.println(getError("上传文件大小超过限制。"));
						return;
					}
					//检查扩展名
					String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();
					if(!Arrays.<String>asList(extMap.get(dirName).split(",")).contains(fileExt)){
						out.println(getError("上传文件扩展名是不允许的扩展名。\n只允许" + extMap.get(dirName) + "格式。"));
						return;
					}

					SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
					String newFileName = df.format(new Date()) + "_" + new Random().nextInt(1000) + "." + fileExt;
					try{
						File uploadedFile = new File(savePath, newFileName);
						item.write(uploadedFile);
					}catch(Exception e){
						out.println(getError("上传文件失败。"));
						return;
					}

					JSONObject obj = new JSONObject();
					obj.put("error", 0);
					obj.put("url", saveUrl + newFileName);
					out.println(obj.toString());
					log.debug("上传图片:[" + newFileName + "]成功");
				}
			}
			
		} catch (Exception e) {
			log.error("图片上传失败:" + e);
			e.printStackTrace();
		}
		
	}
	
	private String getError(String message) {
		JSONObject obj = new JSONObject();
		obj.put("error", 1);
		obj.put("message", message);
		log.debug(obj);
		return obj.toString();
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		doGet(req, resp);
	}

}
